Is AI entirely a part of Computer Science?
AI is an amalgamation of many fields, Computer Science plays a major role in imparting &quot;Intelligence&quot; to the machine. Following is a quote from the best selling AI book Artificial Intelligence: A Modern Approach by
Stuart J. Russell and Peter Norvig.

Artificial Intelligence (AI) is a big field, and this is a big book.
We have tried to explore the full breadth of the field, which
encompasses logic, probability, and continuous mathematics;
perception, reasoning, learning, and action; and everything from
microelectronic devices to robotic planetary explorers.

So, the answer to your question is yes, there are other fields that AI depends including mathematics (to optimize AI algorithms), electronic components (sensors, microprocessors, etc.), mechanical actuators (hydraulic, pneumatic, electric, etc.)
I highly recommend the book if you are looking for a starting point.